Sewing machine special for large size of books is developed and improved according to user's requrement. The machine adopts the features of wide sewing range, stable operation, convenient operation, low noise, and safty design ect. Thin needle and dense needle sets design make the sewing job much more perfect. Frequency conversion speed control, electromagnetic clutch driving and electromagnetic brake for main machine are adopted. Also, sensor protection is equipped on the control button panel. Welcome to visit our official website : http://www.autobindingmachine.com